V^(4+)-rich V_(2)O_(5)/carbon aerogel(V^(4+)-V_(2)O_(5)/CA)composites were synthesized as electrode materials for supercapacitors via in-situ hydrolysis-condensation processing.Carbon aerogel(CA)promotes the depositio...V^(4+)-rich V_(2)O_(5)/carbon aerogel(V^(4+)-V_(2)O_(5)/CA)composites were synthesized as electrode materials for supercapacitors via in-situ hydrolysis-condensation processing.Carbon aerogel(CA)promotes the deposition of amorphous vanadium oxide and catalyzes the crystallization of V^(4+)-rich V_(2)O_(5)nanosheets at much reduced temperature.With a uniform distribution of V_(2)O_(5)nanosheets in CA,the special structure provides a large specific area and reactive sites.CA also synergistically improves the electrical conductivity and structural integrity.In addition,rich V^(4+) would enhance the intrinsic electrical conductivity of V_(2)O_(5),promote ion diffusion and catalyze the electrochemical reactions.Consequently,V^(4+)-V_(2)O_(5)/CA exhibits much enhanced specific capacitance(405 F g^(-1) at 0.5 A g^(-1)),high energy density(56 W h kg^(-1) with a power density of 250 W kg^(-1))and long cycle life(96%capacitance retention after 40,000 cycles).展开更多
基金support from the National Natural Science Foundation of China(51872204,52072261,and 22011540379)Shanghai Sailing Program(21YF1430900)+2 种基金the National Key Research and Development Program of China(2017YFA0204600)Shanghai Social Development Science and Technology Project(20dz1201800)supported by the National Natural Science Foundation(1803256)。
文摘V^(4+)-rich V_(2)O_(5)/carbon aerogel(V^(4+)-V_(2)O_(5)/CA)composites were synthesized as electrode materials for supercapacitors via in-situ hydrolysis-condensation processing.Carbon aerogel(CA)promotes the deposition of amorphous vanadium oxide and catalyzes the crystallization of V^(4+)-rich V_(2)O_(5)nanosheets at much reduced temperature.With a uniform distribution of V_(2)O_(5)nanosheets in CA,the special structure provides a large specific area and reactive sites.CA also synergistically improves the electrical conductivity and structural integrity.In addition,rich V^(4+) would enhance the intrinsic electrical conductivity of V_(2)O_(5),promote ion diffusion and catalyze the electrochemical reactions.Consequently,V^(4+)-V_(2)O_(5)/CA exhibits much enhanced specific capacitance(405 F g^(-1) at 0.5 A g^(-1)),high energy density(56 W h kg^(-1) with a power density of 250 W kg^(-1))and long cycle life(96%capacitance retention after 40,000 cycles).
